mirror of
https://github.com/caddyserver/caddy.git
synced 2024-11-26 02:09:47 +08:00
434 lines
15 KiB
Go
434 lines
15 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package caddyhttp
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import (
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"context"
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"crypto/tls"
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"fmt"
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"net"
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"net/http"
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"strconv"
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"time"
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"github.com/caddyserver/caddy/v2"
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"github.com/caddyserver/caddy/v2/modules/caddytls"
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"github.com/lucas-clemente/quic-go/http3"
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"go.uber.org/zap"
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)
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func init() {
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err := caddy.RegisterModule(App{})
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if err != nil {
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caddy.Log().Fatal(err.Error())
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}
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}
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// App is a robust, production-ready HTTP server.
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//
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// HTTPS is enabled by default if host matchers with qualifying names are used
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// in any of routes; certificates are automatically provisioned and renewed.
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// Additionally, automatic HTTPS will also enable HTTPS for servers that listen
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// only on the HTTPS port but which do not have any TLS connection policies
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// defined by adding a good, default TLS connection policy.
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//
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// In HTTP routes, additional placeholders are available (replace any `*`):
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//
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// Placeholder | Description
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// ------------|---------------
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// `{http.request.cookie.*}` | HTTP request cookie
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// `{http.request.header.*}` | Specific request header field
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// `{http.request.host.labels.*}` | Request host labels (0-based from right); e.g. for foo.example.com: 0=com, 1=example, 2=foo
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// `{http.request.host}` | The host part of the request's Host header
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// `{http.request.hostport}` | The host and port from the request's Host header
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// `{http.request.method}` | The request method
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// `{http.request.orig_method}` | The request's original method
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// `{http.request.orig_uri.path.dir}` | The request's original directory
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// `{http.request.orig_uri.path.file}` | The request's original filename
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// `{http.request.orig_uri.path}` | The request's original path
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// `{http.request.orig_uri.query}` | The request's original query string (without `?`)
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// `{http.request.orig_uri}` | The request's original URI
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// `{http.request.port}` | The port part of the request's Host header
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// `{http.request.proto}` | The protocol of the request
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// `{http.request.remote.host}` | The host part of the remote client's address
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// `{http.request.remote.port}` | The port part of the remote client's address
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// `{http.request.remote}` | The address of the remote client
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// `{http.request.scheme}` | The request scheme
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// `{http.request.tls.version}` | The TLS version name
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// `{http.request.tls.cipher_suite}` | The TLS cipher suite
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// `{http.request.tls.resumed}` | The TLS connection resumed a previous connection
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// `{http.request.tls.proto}` | The negotiated next protocol
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// `{http.request.tls.proto_mutual}` | The negotiated next protocol was advertised by the server
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// `{http.request.tls.server_name}` | The server name requested by the client, if any
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// `{http.request.tls.client.fingerprint}` | The SHA256 checksum of the client certificate
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// `{http.request.tls.client.issuer}` | The issuer DN of the client certificate
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// `{http.request.tls.client.serial}` | The serial number of the client certificate
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// `{http.request.tls.client.subject}` | The subject DN of the client certificate
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// `{http.request.uri.path.*}` | Parts of the path, split by `/` (0-based from left)
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// `{http.request.uri.path.dir}` | The directory, excluding leaf filename
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// `{http.request.uri.path.file}` | The filename of the path, excluding directory
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// `{http.request.uri.path}` | The path component of the request URI
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// `{http.request.uri.query.*}` | Individual query string value
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// `{http.request.uri.query}` | The query string (without `?`)
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// `{http.request.uri}` | The full request URI
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// `{http.response.header.*}` | Specific response header field
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// `{http.vars.*}` | Custom variables in the HTTP handler chain
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type App struct {
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// HTTPPort specifies the port to use for HTTP (as opposed to HTTPS),
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// which is used when setting up HTTP->HTTPS redirects or ACME HTTP
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// challenge solvers. Default: 80.
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HTTPPort int `json:"http_port,omitempty"`
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// HTTPSPort specifies the port to use for HTTPS, which is used when
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// solving the ACME TLS-ALPN challenges, or whenever HTTPS is needed
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// but no specific port number is given. Default: 443.
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HTTPSPort int `json:"https_port,omitempty"`
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// GracePeriod is how long to wait for active connections when shutting
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// down the server. Once the grace period is over, connections will
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// be forcefully closed.
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GracePeriod caddy.Duration `json:"grace_period,omitempty"`
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// Servers is the list of servers, keyed by arbitrary names chosen
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// at your discretion for your own convenience; the keys do not
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// affect functionality.
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Servers map[string]*Server `json:"servers,omitempty"`
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servers []*http.Server
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h3servers []*http3.Server
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h3listeners []net.PacketConn
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ctx caddy.Context
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logger *zap.Logger
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tlsApp *caddytls.TLS
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// used temporarily between phases 1 and 2 of auto HTTPS
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allCertDomains []string
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}
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// CaddyModule returns the Caddy module information.
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func (App) CaddyModule() caddy.ModuleInfo {
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return caddy.ModuleInfo{
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ID: "http",
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New: func() caddy.Module { return new(App) },
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}
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}
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// Provision sets up the app.
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func (app *App) Provision(ctx caddy.Context) error {
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// store some references
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tlsAppIface, err := ctx.App("tls")
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if err != nil {
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return fmt.Errorf("getting tls app: %v", err)
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}
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app.tlsApp = tlsAppIface.(*caddytls.TLS)
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app.ctx = ctx
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app.logger = ctx.Logger(app)
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repl := caddy.NewReplacer()
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// this provisions the matchers for each route,
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// and prepares auto HTTP->HTTPS redirects, and
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// is required before we provision each server
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err = app.automaticHTTPSPhase1(ctx, repl)
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if err != nil {
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return err
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}
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// prepare each server
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for srvName, srv := range app.Servers {
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srv.tlsApp = app.tlsApp
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srv.logger = app.logger.Named("log")
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srv.errorLogger = app.logger.Named("log.error")
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// only enable access logs if configured
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if srv.Logs != nil {
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srv.accessLogger = app.logger.Named("log.access")
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}
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// if not explicitly configured by the user, disallow TLS
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// client auth bypass (domain fronting) which could
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// otherwise be exploited by sending an unprotected SNI
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// value during a TLS handshake, then putting a protected
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// domain in the Host header after establishing connection;
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// this is a safe default, but we allow users to override
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// it for example in the case of running a proxy where
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// domain fronting is desired and access is not restricted
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// based on hostname
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if srv.StrictSNIHost == nil && srv.hasTLSClientAuth() {
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app.logger.Info("enabling strict SNI-Host matching because TLS client auth is configured",
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zap.String("server_name", srvName),
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)
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trueBool := true
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srv.StrictSNIHost = &trueBool
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}
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// process each listener address
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for i := range srv.Listen {
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lnOut, err := repl.ReplaceOrErr(srv.Listen[i], true, true)
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if err != nil {
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return fmt.Errorf("server %s, listener %d: %v",
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srvName, i, err)
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}
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srv.Listen[i] = lnOut
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}
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// set up each listener modifier
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if srv.ListenerWrappersRaw != nil {
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vals, err := ctx.LoadModule(srv, "ListenerWrappersRaw")
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if err != nil {
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return fmt.Errorf("loading listener wrapper modules: %v", err)
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}
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var hasTLSPlaceholder bool
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for i, val := range vals.([]interface{}) {
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if _, ok := val.(*tlsPlaceholderWrapper); ok {
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if i == 0 {
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// putting the tls placeholder wrapper first is nonsensical because
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// that is the default, implicit setting: without it, all wrappers
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// will go after the TLS listener anyway
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return fmt.Errorf("it is unnecessary to specify the TLS listener wrapper in the first position because that is the default")
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}
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if hasTLSPlaceholder {
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return fmt.Errorf("TLS listener wrapper can only be specified once")
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}
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hasTLSPlaceholder = true
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}
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srv.listenerWrappers = append(srv.listenerWrappers, val.(caddy.ListenerWrapper))
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}
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// if any wrappers were configured but the TLS placeholder wrapper is
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// absent, prepend it so all defined wrappers come after the TLS
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// handshake; this simplifies logic when starting the server, since we
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// can simply assume the TLS placeholder will always be there
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if !hasTLSPlaceholder && len(srv.listenerWrappers) > 0 {
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srv.listenerWrappers = append([]caddy.ListenerWrapper{new(tlsPlaceholderWrapper)}, srv.listenerWrappers...)
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}
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}
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// pre-compile the primary handler chain, and be sure to wrap it in our
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// route handler so that important security checks are done, etc.
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primaryRoute := emptyHandler
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if srv.Routes != nil {
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err := srv.Routes.ProvisionHandlers(ctx)
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if err != nil {
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return fmt.Errorf("server %s: setting up route handlers: %v", srvName, err)
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}
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primaryRoute = srv.Routes.Compile(emptyHandler)
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}
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srv.primaryHandlerChain = srv.wrapPrimaryRoute(primaryRoute)
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// pre-compile the error handler chain
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if srv.Errors != nil {
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err := srv.Errors.Routes.Provision(ctx)
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if err != nil {
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return fmt.Errorf("server %s: setting up server error handling routes: %v", srvName, err)
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}
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srv.errorHandlerChain = srv.Errors.Routes.Compile(errorEmptyHandler)
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}
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// prepare the TLS connection policies
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err = srv.TLSConnPolicies.Provision(ctx)
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if err != nil {
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return fmt.Errorf("server %s: setting up TLS connection policies: %v", srvName, err)
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}
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}
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return nil
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}
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// Validate ensures the app's configuration is valid.
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func (app *App) Validate() error {
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// each server must use distinct listener addresses
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lnAddrs := make(map[string]string)
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for srvName, srv := range app.Servers {
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for _, addr := range srv.Listen {
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listenAddr, err := caddy.ParseNetworkAddress(addr)
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if err != nil {
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return fmt.Errorf("invalid listener address '%s': %v", addr, err)
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}
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// check that every address in the port range is unique to this server;
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// we do not use <= here because PortRangeSize() adds 1 to EndPort for us
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for i := uint(0); i < listenAddr.PortRangeSize(); i++ {
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addr := caddy.JoinNetworkAddress(listenAddr.Network, listenAddr.Host, strconv.Itoa(int(listenAddr.StartPort+i)))
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if sn, ok := lnAddrs[addr]; ok {
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return fmt.Errorf("server %s: listener address repeated: %s (already claimed by server '%s')", srvName, addr, sn)
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}
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lnAddrs[addr] = srvName
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}
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}
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}
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return nil
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}
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// Start runs the app. It finishes automatic HTTPS if enabled,
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// including management of certificates.
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func (app *App) Start() error {
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for srvName, srv := range app.Servers {
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s := &http.Server{
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ReadTimeout: time.Duration(srv.ReadTimeout),
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ReadHeaderTimeout: time.Duration(srv.ReadHeaderTimeout),
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WriteTimeout: time.Duration(srv.WriteTimeout),
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IdleTimeout: time.Duration(srv.IdleTimeout),
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MaxHeaderBytes: srv.MaxHeaderBytes,
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Handler: srv,
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}
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for _, lnAddr := range srv.Listen {
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listenAddr, err := caddy.ParseNetworkAddress(lnAddr)
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if err != nil {
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return fmt.Errorf("%s: parsing listen address '%s': %v", srvName, lnAddr, err)
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}
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for portOffset := uint(0); portOffset < listenAddr.PortRangeSize(); portOffset++ {
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// create the listener for this socket
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hostport := listenAddr.JoinHostPort(portOffset)
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ln, err := caddy.Listen(listenAddr.Network, hostport)
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if err != nil {
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return fmt.Errorf("%s: listening on %s: %v", listenAddr.Network, hostport, err)
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}
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// wrap listener before TLS (up to the TLS placeholder wrapper)
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var lnWrapperIdx int
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for i, lnWrapper := range srv.listenerWrappers {
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if _, ok := lnWrapper.(*tlsPlaceholderWrapper); ok {
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lnWrapperIdx = i + 1 // mark the next wrapper's spot
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break
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}
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ln = lnWrapper.WrapListener(ln)
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}
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// enable TLS if there is a policy and if this is not the HTTP port
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useTLS := len(srv.TLSConnPolicies) > 0 && int(listenAddr.StartPort+portOffset) != app.httpPort()
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if useTLS {
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// create TLS listener
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tlsCfg := srv.TLSConnPolicies.TLSConfig(app.ctx)
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ln = tls.NewListener(ln, tlsCfg)
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/////////
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// TODO: HTTP/3 support is experimental for now
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if srv.ExperimentalHTTP3 {
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app.logger.Info("enabling experimental HTTP/3 listener",
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zap.String("addr", hostport),
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)
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h3ln, err := caddy.ListenPacket("udp", hostport)
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if err != nil {
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return fmt.Errorf("getting HTTP/3 UDP listener: %v", err)
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}
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h3srv := &http3.Server{
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Server: &http.Server{
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Addr: hostport,
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Handler: srv,
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TLSConfig: tlsCfg,
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},
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}
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go h3srv.Serve(h3ln)
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app.h3servers = append(app.h3servers, h3srv)
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app.h3listeners = append(app.h3listeners, h3ln)
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srv.h3server = h3srv
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}
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/////////
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}
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// finish wrapping listener where we left off before TLS
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for i := lnWrapperIdx; i < len(srv.listenerWrappers); i++ {
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ln = srv.listenerWrappers[i].WrapListener(ln)
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}
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app.logger.Debug("starting server loop",
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zap.String("address", lnAddr),
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zap.Bool("http3", srv.ExperimentalHTTP3),
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zap.Bool("tls", useTLS),
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)
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go s.Serve(ln)
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app.servers = append(app.servers, s)
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}
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}
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}
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// finish automatic HTTPS by finally beginning
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// certificate management
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err := app.automaticHTTPSPhase2()
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if err != nil {
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return fmt.Errorf("finalizing automatic HTTPS: %v", err)
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}
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return nil
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}
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// Stop gracefully shuts down the HTTP server.
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func (app *App) Stop() error {
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ctx := context.Background()
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if app.GracePeriod > 0 {
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var cancel context.CancelFunc
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ctx, cancel = context.WithTimeout(ctx, time.Duration(app.GracePeriod))
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defer cancel()
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}
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for _, s := range app.servers {
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err := s.Shutdown(ctx)
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if err != nil {
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return err
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}
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}
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// close the http3 servers; it's unclear whether the bug reported in
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// https://github.com/caddyserver/caddy/pull/2727#issuecomment-526856566
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// was ever truly fixed, since it seemed racey/nondeterministic; but
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// recent tests in 2020 were unable to replicate the issue again after
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// repeated attempts (the bug manifested after a config reload; i.e.
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// reusing a http3 server or listener was problematic), but it seems
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// to be working fine now
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for _, s := range app.h3servers {
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// TODO: CloseGracefully, once implemented upstream
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// (see https://github.com/lucas-clemente/quic-go/issues/2103)
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err := s.Close()
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if err != nil {
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return err
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}
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}
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// closing an http3.Server does not close their underlying listeners
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// since apparently the listener can be used both by servers and
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// clients at the same time; so we need to manually call Close()
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// on the underlying h3 listeners (see lucas-clemente/quic-go#2103)
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for _, pc := range app.h3listeners {
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err := pc.Close()
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if err != nil {
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return err
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}
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}
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return nil
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}
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func (app *App) httpPort() int {
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if app.HTTPPort == 0 {
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return DefaultHTTPPort
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}
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return app.HTTPPort
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}
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func (app *App) httpsPort() int {
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if app.HTTPSPort == 0 {
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return DefaultHTTPSPort
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}
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return app.HTTPSPort
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}
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// Interface guards
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var (
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_ caddy.App = (*App)(nil)
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_ caddy.Provisioner = (*App)(nil)
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_ caddy.Validator = (*App)(nil)
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)
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